Rubber Mixture with Dithiophosphate Accelerator for Tire Tread
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Solution Overview
Problem
Existing rubber mixtures for vehicle tire treads face conflicting objectives in achieving improved handling, wet grip, and reduced rolling resistance, where enhancing one property often deteriorates another.
Innovation Solution
A sulfur-crosslinkable rubber mixture containing diene rubber, 0.1-10 phr of dithiophosphate accelerator, and 1-80 phr of liquid polymer, which interacts to create a more homogeneous spatial network, decoupling handling and rolling resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rubber mixtures are used to improve handling, then wet grip deteriorates and rolling resistance increases
Solution Approach 1:
The patent changes the chemical parameters of the rubber mixture by introducing a specific liquid polymer with defined molecular weight (1500-10000 g/mol) and vinyl content (15-50%), along with optimized accelerator combinations. This parameter modification creates a more homogeneous spatial network in the vulcanizate, simultaneously improving handling, wet grip, and reducing rolling resistance without the traditional trade-offs.
Solution Approach 2:
The patent creates a composite rubber mixture system combining diene rubber with specific liquid polymer additives and accelerator systems. This composite approach, where the liquid polymer acts as a modifier within the rubber matrix, enables the achievement of multiple conflicting properties (handling, wet grip, rolling resistance) through the synergistic interaction of components rather than relying on a single rubber type.
2Reliability
If liquid polymer is added to improve wet grip, then rolling resistance increases
Solution Approach 1:
The patent specifies precise parameter ranges for the liquid polymer (molecular weight 1500-10000 g/mol, vinyl content 15-50%) to optimize the balance between wet grip and rolling resistance. By controlling these parameters, the liquid polymer creates beneficial effects at low temperature (improved wet grip) while the optimized accelerator system ensures controlled vulcanization that prevents excessive energy loss at operating temperature.
Solution Approach 2:
The liquid polymer with specific molecular weight and vinyl content creates localized regions with enhanced properties in the rubber matrix. These localized modifications improve wet grip where needed while the overall network structure, influenced by the accelerator combination, maintains appropriate rolling resistance characteristics through controlled crosslinking density.
3Object-affected harmful factors
If zinc oxide content is reduced for environmental reasons, then vulcanization process deteriorates
Solution Approach 1:
The patent introduces a liquid polymer as an intermediary substance that mediates between the zinc oxide activator system and the rubber matrix. This intermediary facilitates the vulcanization process by enhancing the interaction between accelerators and sulfur, allowing for reduced zinc oxide content while maintaining or improving vulcanization efficiency and rubber mixture properties.
Solution Approach 2:
The patent modifies the vulcanization system parameters by optimizing the accelerator combination (using dithiophosphate accelerators in specific amounts) and introducing liquid polymer modifiers. These parameter changes compensate for the reduced zinc oxide content, ensuring that the vulcanization process remains reliable and produces vulcanizates with the desired properties despite lower activator levels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The mixture results in increased hardness for improved handling, enhanced wet braking at 0°C, and reduced rolling resistance at 60°C, while also shortening vulcanization times.
Implementation Method 1
A sulfur-crosslinkable rubber mixture which contains at least one diene rubber, 0.1 - 10 phr of at least one dithiophosphate accelerator and 1 - 80 phr of at least one liquid polymer
Implementation Method 2
The sulfur is then activated for vulcanization through complex formation
Implementation Method 3
which interacts to create a more homogeneous spatial network, decoupling handling and rolling resistance properties
Implementation Method 4
The invention further relates to tires, in particular pneumatic vehicle tires, whose treads are based at least in part on the rubber mixture vulcanized with sulfur
Data Source
AI summary
The invention relates to a sulfur cross-linkable rubber mixture that comprises, for the purpose of imparting it with improved hardness while having an increased loss factor tan d at 0 °C and a reduced loss factor tan d at 60 °C, at least one diene rubber, 0.1-10 phr of at least one dithiophosphate accelerator and 1-80 phr of at least one liquid polymer.